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  • PANGAEA  (60)
  • American Meteorological Society  (11)
  • AGU (American Geophysical Union)  (3)
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  • 1
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    A Comparative Stability Analysis of Atlantic and Pacific Nino Modes (2013)
    American Meteorological Society
    In:  Journal of Climate, 26 (16). pp. 5965-5980.
    Details
    Publication Date: 2020-07-24
    Description: El Niño–Southern Oscillation (ENSO) in the Pacific and the analogous Atlantic Niño mode are generated by processes involving coupled ocean–atmosphere interactions known as the Bjerknes feedback. It has been argued that the Atlantic Niño mode is more strongly damped than ENSO, which is presumed to be closer to neutrally stable. In this study the stability of ENSO and the Atlantic Niño mode is compared via an analysis of the Bjerknes stability index. This index is based on recharge oscillator theory and can be interpreted as the growth rate for coupled modes of ocean–atmosphere variability. Using observational data, an ocean reanalysis product, and output from an ocean general circulation model, the individual terms of the Bjerknes index are calculated for the first time for the Atlantic and then compared to results for the Pacific. Positive thermocline feedbacks in response to wind stress forcing favor anomaly growth in both basins, but they are twice as large in the Pacific compared to the Atlantic. Thermocline feedback is related to the fetch of the zonal winds, which is much greater in the equatorial Pacific than in the equatorial Atlantic due to larger basin size. Negative feedbacks are dominated by thermal damping of sea surface temperature anomalies in both basins. Overall, it is found that both ENSO and the Atlantic Niño mode are damped oscillators, but the Atlantic is more strongly damped than the Pacific primarily because of the weaker thermocline feedback.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/jcli-d-12-00758.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Symmetry of the Atlantic Nino mode (2017)
    AGU (American Geophysical Union) | Wiley
    In:  Geophysical Research Letters, 44 (2). pp. 965-973.
    Details
    Publication Date: 2020-02-06
    Description: El Niño-Southern Oscillation (ENSO) in the Pacific is asymmetric for warm and cold events with respect to amplitude, spatial patterns and temporal evolution. Here the symmetry of the Atlantic Niño mode, which many previous studies have argued is governed by atmosphere–ocean dynamics similar to those of ENSO, is investigated using two different ocean reanalysis products. Calculation of Bjerknes feedback terms for the Pacific reveals a pronounced asymmetry between warm and cold events, though unlike most previous studies, the largest asymmetry is found in the relationship between eastern Pacific thermocline depth and SST anomalies. For the Atlantic, cold events are effectively mirror images of warm events with Bjerknes feedbacks of similar strength. The analysis supports not only the conclusion that Atlantic Niños are more symmetric than ENSO, but the hypothesis itself that the Bjerknes feedback is operative in the Atlantic given the strength of the relationship between the key variables involved.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2016GL071829
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    PIRATA: A Sustained Observing System for Tropical Atlantic Climate Research and Forecasting (2019)
    AGU (American Geophysical Union) | Wiley
    In:  Earth and Space Science, 6 (4). pp. 577-616.
    Details
    Publication Date: 2022-01-31
    Description: Prediction and Research Moored Array in the Tropical Atlantic (PIRATA) is a multinational program initiated in 1997 in the tropical Atlantic to improve our understanding and ability to predict ocean-atmosphere variability. PIRATA consists of a network of moored buoys providing meteorological and oceanographic data transmitted in real time to address fundamental scientific questions as well as societal needs. The network is maintained through dedicated yearly cruises, which allow for extensive complementary shipboard measurements and provide platforms for deployment of other components of the Tropical Atlantic Observing System. This paper describes network enhancements, scientific accomplishments and successes obtained from the last 10 years of observations, and additional results enabled by cooperation with other national and international programs. Capacity building activities and the role of PIRATA in a future Tropical Atlantic Observing System that is presently being optimized are also described.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1029/2018EA000428
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Tropical Instability Waves and Wind‐Forced Cross‐Equatorial Flow in the Central Atlantic Ocean (2022)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: Based on velocity data from a long-term moored observatory located at 0°N, 23°W we present evidence of a vertical asymmetry during the intraseasonal maxima of northward and southward upper-ocean flow in the equatorial Atlantic Ocean. Periods of northward flow are characterized by a meridional velocity maximum close to the surface, while southward phases show a subsurface velocity maximum at about 40 m. We show that the observed asymmetry is caused by the local winds. Southerly wind stress at the equator drives northward flow near the surface and southward flow below that is superimposed on the Tropical Instability Wave (TIW) velocity field. This wind-driven overturning cell, known as the Equatorial Roll, shows a distinct seasonal cycle linked to the seasonality of the meridional component of the south-easterly trade winds. The superposition of vertical shear of the Equatorial Roll and TIWs causes asymmetric mixing during northward and southward TIW phases. Key Points: - Composites of Tropical Instability Waves at 0°N, 23°W show a surface (subsurface) velocity maximum during northward (southward) phases - Meridional wind stress forces a seasonally-varying, shallow cross-equatorial overturning cell-the Equatorial Roll - The superposition of Tropical Instability Waves and Equatorial Roll causes asymmetric mixing during north- and southward phases
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Shipboard acoustic doppler current profiling during cruise TG194 (SAC ID 00302) (2005)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Acoustic Doppler Current Profiler; ADCP; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; Discoverer; LATITUDE; LONGITUDE; Shipboard Acoustic Doppler Current Profiling (SADCP); Ship velocity, absolute east-west, standard deviation; Ship velocity, absolute east-west components means; Ship velocity, absolute north-south components mean; Ship velocity, absolute north-south standard deviation; Temperature, technical; Temperature, technical, standard deviation; TG194; TG194_00302; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 65696 data points
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    DATA PANGAEA
  • 6
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    Shipboard acoustic doppler current profiling during cruise TG193 (SAC ID 00301) (2005)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Acoustic Doppler Current Profiler; ADCP; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; Discoverer; LATITUDE; LONGITUDE; Shipboard Acoustic Doppler Current Profiling (SADCP); Ship velocity, absolute east-west, standard deviation; Ship velocity, absolute east-west components means; Ship velocity, absolute north-south components mean; Ship velocity, absolute north-south standard deviation; Temperature, technical; Temperature, technical, standard deviation; TG193; TG193_00301; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 28756 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Shipboard acoustic doppler current profiling during cruise TG394 (SAC ID 00311) (2005)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Acoustic Doppler Current Profiler; ADCP; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; Discoverer; LATITUDE; LONGITUDE; Shipboard Acoustic Doppler Current Profiling (SADCP); Ship velocity, absolute east-west, standard deviation; Ship velocity, absolute east-west components means; Ship velocity, absolute north-south components mean; Ship velocity, absolute north-south standard deviation; TG394; TG394_00311; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 30146 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Shipboard acoustic doppler current profiling during cruise TG293 (SAC ID 00303) (2005)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Acoustic Doppler Current Profiler; ADCP; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; Discoverer; LATITUDE; LONGITUDE; Shipboard Acoustic Doppler Current Profiling (SADCP); Ship velocity, absolute east-west, standard deviation; Ship velocity, absolute east-west components means; Ship velocity, absolute north-south components mean; Ship velocity, absolute north-south standard deviation; Temperature, technical; Temperature, technical, standard deviation; TG293; TG293_00303; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 22752 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Shipboard acoustic doppler current profiling during cruise TG294 (SAC ID 00310) (2005)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Acoustic Doppler Current Profiler; ADCP; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; Discoverer; LATITUDE; LONGITUDE; Shipboard Acoustic Doppler Current Profiling (SADCP); Ship velocity, absolute east-west, standard deviation; Ship velocity, absolute east-west components means; Ship velocity, absolute north-south components mean; Ship velocity, absolute north-south standard deviation; TG294; TG294_00310; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 31290 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Shipboard acoustic doppler current profiling during cruise TOGA91 (SAC ID 00304) (2005)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Acoustic Doppler Current Profiler; ADCP; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; Discoverer; LATITUDE; LONGITUDE; Shipboard Acoustic Doppler Current Profiling (SADCP); Ship velocity, absolute east-west, standard deviation; Ship velocity, absolute east-west components means; Ship velocity, absolute north-south components mean; Ship velocity, absolute north-south standard deviation; Temperature, technical; Temperature, technical, standard deviation; TOGA91; TOGA91_00304; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 29310 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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